EP 0967743 A2 19991229 - Method and apparatus for optical frequency demodulation of an optical signal using interferometry
Title (en)
Method and apparatus for optical frequency demodulation of an optical signal using interferometry
Title (de)
Verfahren und Vorrichtung zur optischen Frequenzdemodulation eines optischen Signals mittels Interferometrie
Title (fr)
Procédé et dispositif pour démodulation de fréquence optique d'un signal optique utilisant l'interferomètrie
Publication
Application
Priority
GB 9813412 A 19980623
Abstract (en)
The present invention provides an improved optical frequency demodulation technique for extracting overhead information from an optical channel signal carrying both high bit rate payload and low rate overhead data. The invention makes use of asymmetrical Mach-Zehnder interferometry (AMZI) in an optical frequency demodulator to efficiently extract the overhead information from the optical channel signal by frequency discrimination without necessitating a complete demodulation of the optical channel signal. By comparison to existing demodulation schemes, the invention provides an all-optical low cost, high gain technique for recovering the overhead data which improves the payload signal-to-noise ratio and enhance performance. <IMAGE>
IPC 1-7
IPC 8 full level
H04B 10/67 (2013.01); H04B 10/69 (2013.01)
CPC (source: EP US)
H04B 10/67 (2013.01 - EP US); H04B 10/676 (2013.01 - EP US); H04B 10/69 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0967743 A2 19991229; EP 0967743 A3 20020109; CA 2275864 A1 19991223; GB 9813412 D0 19980819; US 6271959 B1 20010807
DOCDB simple family (application)
EP 99304932 A 19990623; CA 2275864 A 19990622; GB 9813412 A 19980623; US 33853099 A 19990623